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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f7b765e22008370e97d536d9a6e912e84d2883ee86899e58d830a4ef68ae7a' 
  AND token = '5bDH/KGlEt3KaiIRNYXxR82DNmlH0rzisv61GLwTXcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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