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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b3d65b288c4d41b797eec86614cd8487d625d8674cee9b4279c70834ecc699' 
  AND token = 'iFzHCYBUcjCJJjR5lNJR1V5C0YucXUz1II/rrkW2OzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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