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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e357c1ef98c262af6fd21b10a8e5906820e65405704f60bcc9ca62f4f15ec67a' 
  AND token = 'E/sFj9/MUYtEj1cVNmRcm/Si9gSQVTebcQCtToqGdrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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