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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e353bebb416dffab924ceee9c5e14288359ce68061226674edee18b031790f' 
  AND token = 'tOZZWElgQc3iMZzSzmnCy8yiPIOMU/HzdRinn5pvd3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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