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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa9496bbc4ad8602e503a30e572e88b56b6a2e56f9cf50d5b4d852beacd0fa2' 
  AND token = 'NJ5aGNIJDbINq1CmYWsnxr/skS+sGVMEqaAU2+c5l5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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