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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca52530a7bc6fda5581960cc2a018751041f9c00dbbec3a9b3608795081eed' 
  AND token = 'cG8x0kvqVQGexQzdXL/B80qD/vvW5MyX4vGSKFvcUzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}