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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d552009ec5cac21f98aa0cffded7bd7b25c16ed717f9138559fe2848e119a6d' 
  AND token = 'hkVfMQcdHVQYtedwnWFmhO8pKykC537elX/3pXg85BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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