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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0395da4792ae53adb793924137f94478e578fc80d59fbd46f9410977452f78' 
  AND token = 'JLVeEf7nIOfKmP01DaFEuUPCDZ54g2zdbwW3a7r5Z+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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