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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406cae2be481f00a16d90ebf8beae9b04b22e3a943e92078ed2a0fd241dc9866' 
  AND token = 'jGgiPadvFFHmJxJ8T4KuTnIZETOqBJyg/tPtiXXYvM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00228

JSON explain

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