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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434055fe649721b9803d2b56a0f70943ebc645ee1b9397189f5f31a1648be616' 
  AND token = 'ssWlfjY5LlZ5OoVvwY7jUvkh2cbLAmpKedCOoHZOH9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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