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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20a8c64bbcb6b18b4b906e79e8036113ea19669666576cbbe1136c0ca404870' 
  AND token = 'a1e579cKPOR6s0xnemG16+A0IJ3uY9qs9FXatq0Wo6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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