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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537d889bdbbf9a188f82c454d59a973676450f37f5d032bf4499b2a883fbffe1' 
  AND token = 'NtJ7Kirz7prG0ouP7PgsLE1hnziRjiUBhXEsT6sKONA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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