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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db76d1559f125157594541c0ae32d8632a707e144cc6caa811b8aa81e5a735d6' 
  AND token = 'rD9hKCdbrQHcBRP63bT38YnEVfp0pFSSP1GGVbsQs28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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