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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aed28cecbe12219d85c000794cea83ec7b4f9655c050a0442179786e6913e0' 
  AND token = '8yP9QYaaQEjjDayLc8tX59WFvPZt9OW6NZ/nBgH3h5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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