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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609892daa676646b8be84800e7509d9d0635b14e6f9bbeda8492033608eecd03' 
  AND token = 'xL/b/3g6EaimqymfagYTwJWXfwjJCi0bFuZpG9L0geY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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