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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b46148e11ff6bf1baa69f44c5f9a452f60130bc0956553170e1e00632afe1b3' 
  AND token = '5p4MlK8zD9T3XyWYrQ0ZFkHDsJWYdVoz6izOJwohqdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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