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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dca25a457a1b62bbbccdbee87982c86aa23f9ab25d11f9eedbec18d233081af' 
  AND token = '7VdXrrjiaT0rkDws/ebyvg5RFHydJ57Y8BcsNS2vP2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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