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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffcc7fc8ab945591f818475c16d4723ecc9d8b3dc1e57c87564b1fee508d5c0' 
  AND token = 'ts7zOfp3QlOKNAShRQlAatq71a+ljjal3/3S1LikfGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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