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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb0c7398b7ef960ec05c1f5f6cb4de877dc465348b9d3e7d2ccacb15fca26d4' 
  AND token = 'K/G0FV83dJXvGbeDNkuBulu/ee3wMV8lA9CzuZqmPx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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