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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c555b884edfa36d6a13f4d3247b5bef2d5466a15850a0fbd0c3416adf22ae468' 
  AND token = '7V3rtstP2htcpP0A7DjHDVU4mj6Gp6MLhHKBKIDmMdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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