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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b084e3ef511e6024390c755b88950aaa35fb800a7d27527b706471e003a323fd' 
  AND token = 'd2+2dbEe5RU0dhRSOM/E0lXnXch24RXBxamr4bR//xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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