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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afef0ca58e3a401d411f1635971ed8c353913aa649a85e7797cbab84de8b3214' 
  AND token = 'uGI70S3kpni0JPdgmf3QohYMNZ1DN8COwCTdga6NnmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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