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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd8a77c1590e88d812a694611cc151632d6b6afa749d1e85c1673cc7fbdb154' 
  AND token = '1JGw8RtCxzr4s2PRhWsIrz9AQVoPDsnZ2yQ8Ab0Tg2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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