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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2513a1e437f96d1dd18351c00ec741c22687ca2b66f3cf8079d25a7103bb95' 
  AND token = 'cNbh3Yej4sYC8iioFsDH/oyCpIprRM7igjx49KvRV6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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