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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbc81e26cfbc92dc1ae3e74f927b3e22e0f8786bceff7b878ce6fe366ffa94a' 
  AND token = 'wY3stmcUE4lwRB8GYdSybzUWLGnWPbDrr8EwMr5NZjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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