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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7079261dbbd658a907507bb6375d60726e6ad5da6da888ba66b7be28173895' 
  AND token = 'mlh83fHa0c04SEBK7xoiIdxzPqj0PCq+9ckl6+Z9aSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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