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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d9eb1b67d159a78500d93b52d0f7c4cfcfc9068197038a7de2310e25931ad5' 
  AND token = 'aiug8e3j/kEka4pMAYmM7ImwPcgHmh40tkWmydUMemE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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