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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f817129811d4461f77cd354cb5956f84d5ebb82f122907c174b1b3b918a26df' 
  AND token = '7tS+tYmVs9bxRw6mh7xoZbYSPv8u/Y0yTri6mOAqw1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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