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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8041b6f860d4b5bdb61877bd7d100f4018224c3e9aaa024a4ad69b21574e7ed9' 
  AND token = 'gG5n2onKkuLVxHNiGx3lpA1+84ZgC5fJd8q2X+x9EUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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