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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db99f2b2b365cbe45ea9d6617c63f7a16bf2c00da69a33fa8a2723c9fa23b94' 
  AND token = 'V5tcptti4vMV72sZ6vx7LTDqNnDr/1qWoWE8XcS40Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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