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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdc30221485966f8af1575a9483132cebd6ece430669e00fb4b31b47b08c87b' 
  AND token = 'TIJmqn1JeqM0hosMYKb4L61Nk3/F0FNh7gMPADUVcP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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