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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e4db6dbf8b893cbe062a32a097d982c1b995cb8c72be30bb4bd70e50699401' 
  AND token = 'fLVZpnqDRzpcRtp0NsyTZddm7Q8s5YsXOED7uPYu7Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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