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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229ab47043b9a36c1cc95cf4d111b4896ddff8eb7281b7e6adfcd96ddee1009c' 
  AND token = 'ePbelDn6y5+Jb0pdBTvQySfJJz+YW34cbQX9VO2ujo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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