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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52756ba06d1c4d2509bbade3fa872ec0af7d25d5c597b8ab51ea7b30cbea0aa8' 
  AND token = 'hiJarpW8p8+b6ecLWL4SCTgyUmJx1xop1vyxYHdyK1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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