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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d60b67c2d6a33c2b7303c9c24857938524e72b103c90452ba14a8aa8e31bf8a' 
  AND token = '+be0bcPCOkFGHWTW8I1fikx0Tl44AewFKwZcoShnA88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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