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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40fab820b5cb123e0b996a94a853aed2bbca36a0c334fb9423ad09f120023f3' 
  AND token = 'DcP/LiNDWWTqld6nmaDtb1cXw+K7ev8hKmWB/7RHkPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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