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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a3844ffd06a0956992eeb73a03078738b27e6c6ff7a48452d772601de87884' 
  AND token = 'Bim2n6QgTkpcWZ8GUoOpZlSNJU4bP5VrEJ9ZDQgg4Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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