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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9e2901ce83989dfcbf2084a1b6698c8bf6f2507a6704c980f70e02eff27e8b' 
  AND token = '58gyigSY0wvsngZalkb9ggs3oC9AixugoghOZkV89pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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