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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d09c2a274f2814b08612e14e6ea814944dd77c8dc0b3f7c67fbddc17e1401db' 
  AND token = 'a0sQWGzoXIwE8vSjGB5sWyU7R8H6TimsZOzNMNGeFvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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