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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a8bc56f3f0e7301d72c3aeec72129f5f1c9755a78bb9163eb8e5d9b52abcb1' 
  AND token = 'f8HA/uIK5derfIQ+0XgEwDwEp/JJ5gaPffVHi/cOpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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