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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f5aa33ac9c397d8ccfbdf556c320c91123794463d09c1d4855d5a7f0164666' 
  AND token = 'm+/dQPhPtH9EPlxRtphx+PbVLrG3DhzZiGSk8fzepw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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