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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27c14428c75a0142e0a01344b50f716916aaad4b2979781ed94c82e4bf0c9c7' 
  AND token = 'fCL6FoYbmqTKRAvFRjrUqLURos+ogjdOLCJ5nYna4bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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