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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6d8273b43998f68697b6bec01b31f66e804be17378cfd4056cf6acfb4542f0' 
  AND token = 'EqAroetIfb3MEWL8lO/nbmabb2TNQ2ZVdo0d8dwURb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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