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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8352ab399edd17eb35d44d4b36f0d11485f565e75bc3aa4a1be76fafa1ad0715' 
  AND token = 'utH1XO6kDMcwyYeePa4sXHbL+vH/0gj/14YJBffebbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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