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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b054d69a40ed8f310e6ff27ba1266feedd28e04624f637904c129d5300125447' 
  AND token = 'RdNu7LDPVHMSbiumQPpt0462eeQhBRLRUDKjH/di3Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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