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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6ceab0b3db85673d4c03a8277dc25811f4a4a8c7f50c38dc41d0d0f6ee2fd7' 
  AND token = 'Hj8TGb5QOgQJJDu3cUTFafHE/sxL8Rml3zPFBbrJILE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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