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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f10be8764e6918ef06b099ce38262c11445c277d28cbfcbe2139ae26bfdca86' 
  AND token = 'DT0Asv5aWk7SUVw13ILPXjxmq44LayuExl5L00knzss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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