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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6216398897531ef5c1b72e89659cfe2d6af02f1518e6fe192d858ef14f51cda9' 
  AND token = 'DduV/48d8j0/dJFH3ytJVIcx2X3762RXP5dZt7C/rPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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