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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468b72762705f5287ab5499a93a19436d029293a9f0eba29b4cdc463ad20babc' 
  AND token = 'Y8WriG5skSEqjCVGOQ4GI3KujrZTXErWH6whIcLcEQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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