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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa74f4b84a0f7725559e397cf61c8cf581b2e564c71f8b52180b9379e6a901cb' 
  AND token = '4k2nLTz1G7lbwXL/5JyxBx8npehJQ1TFZ28z6B4TNWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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