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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95e0a4bce4b4de23094fd535888538f2ebcd583eb488c839dc4468be548c868' 
  AND token = '2hC0x0yfP2Ez1FZmkaJgpC/vbV81j3wots8rodi2ebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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