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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2704724af0585d9da23f0537cecc5a6887c6fd2d4552299f91efd28f55b4dbd' 
  AND token = 'LagDgI7AVl2db4Q2sAzmMudHwWnTr77hnr8GhkkXsOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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