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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5164f77e9dcda987baf017da791933d24c8f54b559583f94bdac5a5e48a53f' 
  AND token = 'Xw8zzBDj6lgG3KW4VVWEB6aFba8dEszBBoYnOwnRLco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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