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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a206041f2a90bda92b4eeca2415da961214037ed9f38987d1b0fe80fcdd3155a' 
  AND token = '9CwzEa8tV6hGehz9vs34HU/eyOD1MrEAnwQCKHlX/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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