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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9389e4333f9e5f9b752a82602334bd832dacd2901eb1ea83dcda139b0eb454da' 
  AND token = 'EhZT30/AvBDLWhBlJyqjbuNbX0BNfh3fhV2hHe/le6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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